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-rw-r--r--pkgs/tools/backup/zbackup/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/backup/zbackup/default.nix b/pkgs/tools/backup/zbackup/default.nix
index f1dd30249fb..24b4684745c 100644
--- a/pkgs/tools/backup/zbackup/default.nix
+++ b/pkgs/tools/backup/zbackup/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
 
   # zbackup uses dynamic exception specifications which are not
   # allowed in C++17
-  NIX_CFLAGS_COMPILE = toString [ "--std=c++14" ];
+  env.NIX_CFLAGS_COMPILE = toString [ "--std=c++14" ];
 
   buildInputs = [ zlib openssl protobuf lzo libunwind ];
   nativeBuildInputs = [ cmake protobufc ];